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  <title>CSS练习</title>
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    <ul>
        <li><a href="../01/index.html">第一次练习</a></li>
        <li><a href="../02/css.html">CSS练习</a></li>
      <li><a href="../index.html">返回首页</a></li>
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      <h1 style="text-align: left;">样式表的三种方式</h1>
      <ul>
        <li>外部样式表</li>
        <li>内部样式表</li>
        <li>内嵌样式表</li>
      </ul>
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    <h1>感受痛苦</h1>
    <h1 id="box">盒模型</h1>
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        <h1 style="text-align: center;">麻了</h1>
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        <h1>CSS选择符</h1>
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